Dihexadecyl

The ITIES with an adsorbed monolayer of surfactant has been studied as a model system of the interface between microphases in a bicontinuous microemulsion [39]. This latter system has important applications in electrochemical synthesis and catalysis [88-92]. Quantitative measurements of the kinetics of electrochemical processes in microemulsions are difficult to perform directly, due to uncertainties in the area over which the organic and aqueous reactants contact. The SECM feedback mode allowed the rate of catalytic reduction of tra 5-l,2-dibromocyclohexane in benzonitrile by the Co(I) form of vitamin B12, generated electrochemically in an aqueous phase to be measured as a function of interfacial potential drop and adsorbed surfactants [39]. It was found that the reaction at the ITIES could not be interpreted as a simple second-order process. In the absence of surfactant at the ITIES the overall rate of the interfacial reaction was virtually independent of the potential drop across the interface and a similar rate constant was obtained when a cationic surfactant (didodecyldimethylammonium bromide) was adsorbed at the ITIES. In contrast a threefold decrease in the rate constant was observed when an anionic surfactant (dihexadecyl phosphate) was used. 

DGDG digalactosyl diacylglycerol DHPC dihexadecyl phosphatidylcholine DMPC dimyristoyl phosphatidylcholine DOPC dioleoyl phosphatidylcholine DPPC dipalmitoyl phosphatidylcholine EYPC egg yolk phosphatidylcholine POPC 1-palmitoyl 2-oleoyl-phosphatidylcholine SBPC soya bean phosphatidylcholine... 

Adsorption Cycle Fig. 2.23 QCM responses on LbL assemblies (a) LbL assembly between dihexadecyl phosphate vesicle and PDDA (b) LbL assembly between anionic cerasome (larger step) and PDDA (smaller step) (c) LbL assembly between anionic cerasome (larger step) and cationic... 

AA Agbodjan, H Bui, MG Khaledi. Study of solute partitioning in biomem-brane-mimetic pseudophases by electrokinetic chromatography dihexadecyl phosphate small unilamellar vesicles. Langmuir 17 2893-2899 (2001). 

Figure 7.7 Schematic representation of the temperature-induced change in the MSP composed of terpy end-capped ditopic monomers and Fe dihexadecyl phosphate. The temperature-induced transition resuits in a distortion of the metal ion coordination geometry, which occurs because of the melting of the amphiphilic counterions, giving rise to a reversible transition from a diamagnetic low spin state to a paramagnetic high spin state (Bodenthin et al. 2005).

Fig. 93. Transmission electron micrograph of electrochemically generated silver particles under dihexadecyl phosphate monolayers kept at a surface area of 45 A2/molecule. The monolayer was floated on a 1.0 x 10-2 M AgN03 solution...

Single-bilayer dihexadecyl phosphate (DHP) vesicles Magnetite particles prepared in situ in vesicles, from Fe2+/Fe3+ and OH Particles were characterized by magnetic birefringence 790... 

All the aforementioned evidence for cluster formation is indirect. In this laboratory we have recently observed a special type of cluster formation that supports the notion that such clusters may exist. Rey and McConnell41 have described the preparation of two spin labels, N,N -dipalmitoyl-N,N -bis-(l-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)-l, 10-diaminodecane (VII) and N,N -dimethyl-N,N -dihexadecyl-N,N -bis-(l-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)-1,10-diammoniumdecane diiodide (VIII). 

Dihexadecyl phosphate [2197-63-9] M 546.9, m 75". Crystd from MeOH [Lukac JACS 106 4387 1984. ... 

Synthesis of Dialkyl Ester Tail Compounds 1661 Dihexadecyl 2-Ammopentanedioate [8, R = (CH2)15Me] ... 

Roks, M. F. M. Nolte, R. J. M., (1992) Biomimetic macromolecular chemistry design and synthesis of an artificial ion channel based on a polymer containing cofacially stacked crown ether rings. Incorporation in dihexadecyl phosphate vesicles and study of cobalt ion transport Macromolecules 25, 5398-5407. 

An aliphatic ketone (9-heptadecanone) and two keto derivatives of stearic acid (as potassium salts) containing a ketone functionality either at position 5 or 12 were incorporated into bilayers of the phospholipid l,2-dihexadecyl-sn-glycero-3-phosphocholine. Infrared spectra of these mixtures were measured as a function of temperature and amount of added cholesterol. It was found that the presence of cholesterol in these bilayers induces changes in the location of the guest ketone and that these changes are dependent on both temperature and cholesterol concentration. It is also demonstrated that, in the gel phase, the presence of cholesterol induces larger intersheadgroup separations and, therefore, water penetrates deeper into the lipid bilayer. 

Dihexadecyl-sn-glycero-3-phosphocholine (DHPC) was obtained from Fluka Chemical Corp. (Hauppauge, NY) and 9-heptadecanone (9HP) was from Aldrich (Milwaukee, WI) they were used as received. The preparation of 5-oxo potassium stearate (5-oxo KSA) and 12-oxo potassium stearate (12-oxo KSA) has been described before (10). 

DHPC l -dihexadecyl-sn-glycero-3-phosphocholine KSA potassium stearate 5-oxo KSA 5-oxo potassium stearate 12-oxo KSA 12-oxo potassium stearate 9HP 9-heptadecanone Tc temperature of the gel-to-liquid crystal phase transition of DHPC bilayers 43.41C... 

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